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The '''halogens''' or '''halogen elements''' () are a group (periodic table)|group in the periodic table consisting of five chemically related chemical element|elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The artificially created element 117 (ununseptium) may also be a halogen. In the modern IUPAC nomenclature, this group is known as '''group 17'''. The name 'halogen' means 'salt-producing'. When halogens react with metals they produce a wide range of salts, including calcium fluoride, sodium chloride (common salt), silver bromide and potassium iodide. The group of halogens is the only Group (periodic table)|periodic table group that contains elements in three of the four main states of matter at Standard conditions for temperature and pressure|standard temperature and pressure. All of the halogens form acids when bonded to...
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